package uk.co.q3c.deplan.client.domain.dag;

/*
 * Copyright The Codehaus Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may
 * obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions
 * and limitations under the License.
 */

import java.util.Iterator;
import java.util.List;

public class CycleDetectedException extends Exception {
	private List cycle;

	public CycleDetectedException(final String message, final List cycle) {
		super(message);

		this.cycle = cycle;

	}

	public List getCycle() {
		return cycle;
	}

	/**
	 * @return
	 */
	public String cycleToString() {
		final StringBuffer buffer = new StringBuffer();

		for (Iterator iterator = cycle.iterator(); iterator.hasNext();) {
			buffer.append(iterator.next());

			if (iterator.hasNext()) {
				buffer.append(" --> ");
			}
		}
		return buffer.toString();
	}

	@Override
	public String getMessage() {
		return super.getMessage() + " " + cycleToString();
	}
}
